Separation and recovery of sulfur from direct leach residue of zinc oxygen pressure leaching by dissolution in n-decane and recrystallization

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2024-05-13 DOI:10.1016/j.hydromet.2024.106319

Lijie Chen , Shenghui Wen , Ao Gong , Xiaoqiang Yu , Jiacong Xu , Qin Yi , Lei Tian , Ruixiang Wang , Zhifeng Xu

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Abstract

The effective recovery and utilization of elemental sulfur in the direct leach residue (DLR) from zinc oxygen pressure leaching poses a significant challenge. This study analyzes the distribution characteristics of sulfur in DLR and determines its solubility in n-decane at various temperatures. Results indicate a gradual increase in sulfur solubility with temperature, reaching a maximum of 6.84 g/100 mL at 150 °C Utilizing the Apelblat model, a fitting equation of lnX = 88.3–7155.9/T − 12.0lnT is derived. Under conditions of 130 °C, a liquid–solid ratio of 8:1, a reaction time of 3 min, and a stirring speed of 300 rpm, 99.2% of sulfur in the residue can be dissolved in n-decane. Additionally, this separation process naturally enriches other valuable elements in the residue. The cooling rate significantly influences sulfur purity, with elemental sulfur forming high-quality crystals exhibiting a positive octahedral rhombic morphology at a cooling rate of 0.018 °C/s. Finally, the dissolution mechanism of sulfur in n-decane involves sulfur complexation, and the reliability of the sulfur solubility model is verified.

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利用正癸烷溶解和重结晶技术分离和回收锌氧压浸出直接浸出残余物中的硫

如何有效回收和利用锌氧压浸出直接浸出残渣（DLR）中的元素硫是一项重大挑战。本研究分析了 DLR 中硫的分布特征，并确定了不同温度下硫在正癸烷中的溶解度。结果表明，硫的溶解度随温度的升高而逐渐增大，在 150 °C 时达到 6.84 g/100 mL 的最大值。利用 Apelblat 模型，得出了 lnX = 88.3-7155.9/T - 12.0lnT 的拟合方程。在 130 °C、液固比为 8:1、反应时间为 3 分钟、搅拌速度为 300 转/分钟的条件下，残渣中 99.2% 的硫可以溶解在正癸烷中。此外，这一分离过程还能自然富集残渣中的其他有价元素。冷却速度对硫的纯度有很大影响，在冷却速度为 0.018 °C/s 时，元素硫会形成高质量晶体，呈现正八面体菱形形态。最后，硫在正癸烷中的溶解机理涉及硫络合，硫溶解度模型的可靠性得到了验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.